Abstract: A DC power transmission system of a voltage source converter using a pulse-interleaving auxiliary circuit is disclosed. The converter system of the present invention comprises an IGBT converter for converting an AC power to a DC power or the DC power to the AC power; an open Y-Y transformer and a Y-? transformer for stepping up or stepping down the AC power having a predetermined magnitude; a capacitor for dividing a DC voltage; and a transformer and a half-bridge auxiliary circuit for overlapping a pulse type input voltage to increase a number of pulses of an output waveform. In accordance with the present invention, the normal transformer is used instead of a tapped transformer to reduce the size thereof and to obtain an accurate transformer ratio, the 3-level half bridge is used instead of the H-bridge to reduce the switching loss in order to increase the number of pulses of the output waveform by superposing the voltage in the form of the pulse using the auxiliary transformer and the bridge circuit.

Abstract: Disclosed herein are a printed circuit board and a method of manufacturing the same, which can achieve reliable heat resistance because heat radiation characteristics are improved, and processing costs of which are reduced because processing times are shortened.

Abstract: The invention provides a multi-bead assay system for a protein based assay comprising at least two different beads. The first bead comprises protein and a protein stabilization matrix. The first bead forms a first solution when dissolved in liquid, and the first solution permits a first activity level for the assay. The second bead comprises a potentiation bead matrix that when dissolved in the first solution forms a second solution that potentiates the protein based assay to achieve a second activity level that is higher than the first activity level.

Abstract: An enclosure accommodating a camera in which an image from a surveillance camera, rotating in a vertical direction, is not distorted and which is easily separated from and combined with the surveillance camera. The enclosure can include a cover dome having a hemispheric shell shape and a window, through which light passes, provided on a side of the cover dome, and a cover dome combining portion having a hemispheric shell shape, combined between the cover dome and an open surface, and accommodating a camera in the cover dome having the hemispheric shell shape, wherein surfaces where the cover dome and the cover dome combining portion combine with each other, are at a predetermined inclined angle.

Abstract: Disclosed is a method of uniformly dispersing and coating an additive on ceramic powder. The method includes adding ethenylbenzene into at least one aqueous solution or at least one sol of metal salt selected from a group consisting of nitrate, acetate, oxide, and carbonate of Mg, Y, Dy, Mn, Ba, and Ca, and adding (Ba(1-x)Cax)TiO3 ceramic powder (0?x?0.05) into a resulting solution or sol to preliminarily mix a resulting mixture, deagglomerating and mixing the preliminarily mixed mixture using a Beads Mill, spray drying the deagglomerated and mixed mixture, and calcining the dried mixture at 400 to 700° C. According to the method, an additive is uniformly coated and dispersed on dielectric ceramic powder, thus the sintering of fine particles constituting the ceramic powder is desirably controlled, and dispersibility of the additive on the ceramic powder is improved.

Abstract: A synthetic resin bag is used for storing grain or animal feed. The bag includes an inner layer made of polypropylene textile woven in gauze, a coating layer attached to an inside surface of the inner layer, and an outer layer attached to an outside surface of the inner layer. Attaching between the layers is made by polypropylene resin applied thereto. The coating layer is made of high-density polyethylene film, and the outer layer is made of oriented polypropylene film mixed with non-slip material for raising coefficient of friction of the outer layer to 0.5 or more. Also, the outer layer has a printed inside layer. The bag allows inhibiting penetration of moisture in the air and preventing absorption or leakage of fat or oil in contents. Also, the bag is prevented from slipping and falling when stacked or conveyed.

Abstract: Mannitol in certain weight percentages can be used to produce lyophilized beads of consistent size, consistent morphology, and reduced moisture content. These mannitol-containing lyophilized beads are useful in a variety of biological applications where precise reagent amounts are required or moisture-sensitive components are utilized. PCR technologies represent one biological application where mannitol-containing lyophilized beads can be used.

Abstract: This invention is related to new ethylaziridine derivatives of formula (I) and their preparation. The compounds are useful synthetic intermediates for the synthesis of HIV protease inhibitors and oligopeptide mimetics.

Abstract: A method of driving DC plasma display panels according to a DC mode memory system is provided. According to the method, a compensation pulse for eliminating or reducing the contamination of a displayed image resulting from the application of a write pulse is applied to a position close to the write pulse. The method of the present invention has various advantages that the contamination of a displayed image generating in a direction normal to the display screen is eliminated or reduced; when the method is performed according to a DC mode memory system, the light-emission time can be concentrated to reduce the generation of false outlines so that the general image quality can be remarkably improved; and the electrical power required for the application of the maintenance pulse can be saved to thereby improve efficiency.

Abstract: Secretion signal peptides of inulinases derived from Kluyveromyces marxianus, which makes a heterologous protein produced in a yeast cell be secreted almost completely into the extracellular medium; nucleotide sequences encoding said secretion signal peptides; expression and secretion vectors comprising nucleotide sequences encoding said secretion signal peptides; recombinant yeast cells transformed with said expression and secretion vectors; and a process for producing heterologous proteins by culturing said recombinant yeast cells.